.item {
  line-height: 28px;
  padding-right: 28px;
  display: block;
  transition: all 0.25s;
  cursor: pointer;
  position: relative;
}
.item:hover,
.active {
  background-color: #efefef;
}
.icon {
  font-size: 10px;
  position: absolute;
  right: 10px;
  top: 9px;
  color: #999;
  transition: all 0.25s;
}
.icon.rotate {
  transform: rotate(180deg);
}
.wrap {
  width: 200px;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  overflow-y: auto;
}
